IBM RS/6000 SP, Problem Determination Manual

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Appendix B. The SDR Structure
The SDR is the central data repository for the RS/6000 SP. The communication
with the SDR is through a client/server relationship. The server is represented
by a process (daemon) running on the Control Workstation, the client portion is
represented by different SP commands, and it is also represented by SP
subsystems that query the SDR to retrieve information about the SP
configuration or values for state variables.
The organization of the SDR database is based on object classes. Each object
class contains different attributes, and there can be many instances of a
particular object class.
When the SP is partitioned, some of the SDR classes are also partitioned. Each
partition will have a different SDR process (daemon) who will manage the SDR
database portion that has been partitioned.
Figure 142. The SDR Structure
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Copyright IBM Corp. 1996
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